Expanding mandrels are precision tools designed to hold and secure workpieces with internal bores. These mandrels are cylindrical and typically made from hardened steel, with a slightly tapered body and a series of expandable, segmented sleeves. When inserted into the bore of a workpiece, the mandrel can be expanded to grip the interior surface firmly, providing a stable and accurate holding solution.
The key feature of an expanding mandrel is its ability to provide a uniform, secure grip on the inside diameter of the workpiece. This is achieved by tightening a central screw or nut, which causes the segments of the mandrel to expand outward evenly. This expansion allows the mandrel to adapt to slight variations in bore size while maintaining concentricity with the workpiece. The design ensures that the workpiece is held securely without distorting its shape, which is crucial for maintaining accuracy.
Expanding mandrels are particularly useful when working with parts that have precise internal dimensions or need to be machined or inspected with a high degree of accuracy. They allow the workpiece to be held firmly in place while operations are performed, ensuring that the piece remains centered and aligned. This makes them ideal for situations where external clamping methods might not be suitable, particularly with delicate or thin-walled components.
These mandrels come in various sizes to accommodate different bore diameters, and their ability to expand means that a single mandrel can be used for a range of bore sizes within a specific range. Their versatility and precision make them an essential tool for tasks requiring the reliable holding of parts with internal bores, ensuring accuracy and stability throughout the process.